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 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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package org.elasticsearch.index.reindex;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.bulk.byscroll.AsyncDeleteByQueryAction;
import org.elasticsearch.action.bulk.byscroll.BulkByScrollParallelizationHelper;
import org.elasticsearch.action.bulk.byscroll.BulkByScrollResponse;
import org.elasticsearch.action.bulk.byscroll.DeleteByQueryRequest;
import org.elasticsearch.action.bulk.byscroll.ParentBulkByScrollTask;
import org.elasticsearch.action.bulk.byscroll.WorkingBulkByScrollTask;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.ParentTaskAssigningClient;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

public class TransportDeleteByQueryAction extends HandledTransportAction<DeleteByQueryRequest, BulkByScrollResponse> {
    private final Client client;
    private final ScriptService scriptService;
    private final ClusterService clusterService;

    @Inject
    public TransportDeleteByQueryAction(Settings settings, ThreadPool threadPool, ActionFilters actionFilters,
                                        IndexNameExpressionResolver resolver, Client client, TransportService transportService,
                                        ScriptService scriptService, ClusterService clusterService) {
        super(settings, DeleteByQueryAction.NAME, threadPool, transportService, actionFilters, resolver, DeleteByQueryRequest::new);
        this.client = client;
        this.scriptService = scriptService;
        this.clusterService = clusterService;
    }

    @Override
    public void doExecute(Task task, DeleteByQueryRequest request, ActionListener<BulkByScrollResponse> listener) {
        if (request.getSlices() > 1) {
            BulkByScrollParallelizationHelper.startSlices(client, taskManager, DeleteByQueryAction.INSTANCE,
                    clusterService.localNode().getId(), (ParentBulkByScrollTask) task, request, listener);
        } else {
            ClusterState state = clusterService.state();
            ParentTaskAssigningClient client = new ParentTaskAssigningClient(this.client, clusterService.localNode(), task);
            new AsyncDeleteByQueryAction((WorkingBulkByScrollTask) task, logger, client, threadPool, request, scriptService, state,
                    listener).start();
        }
    }

    @Override
    protected void doExecute(DeleteByQueryRequest request, ActionListener<BulkByScrollResponse> listener) {
        throw new UnsupportedOperationException("task required");
    }
}
